JPWO2019193869A1 - Electrode plate, electrode body and battery - Google Patents

Electrode plate, electrode body and battery Download PDF

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JPWO2019193869A1
JPWO2019193869A1 JP2020511638A JP2020511638A JPWO2019193869A1 JP WO2019193869 A1 JPWO2019193869 A1 JP WO2019193869A1 JP 2020511638 A JP2020511638 A JP 2020511638A JP 2020511638 A JP2020511638 A JP 2020511638A JP WO2019193869 A1 JPWO2019193869 A1 JP WO2019193869A1
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positive electrode
core body
electrode plate
identification display
electrode
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JP7262020B2 (en
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芳洋 三好
芳洋 三好
良徳 酒井
良徳 酒井
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Panasonic Intellectual Property Management Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

電極板は、帯状の芯体と、芯体の両面に形成された活物質層とを有し、芯体が露出された露出部に集電リードが接続されている。露出部は、芯体の長手方向一部に配置され、露出部のうち、集電リードとは異なる位置に、製造工程の履歴を特定可能な識別表示部が形成される。芯体において、識別表示部とは芯体の厚み方向の反対側の位置に、活物質層が配置される。The electrode plate has a band-shaped core body and active material layers formed on both sides of the core body, and a current collecting lead is connected to an exposed portion where the core body is exposed. The exposed portion is arranged in a part of the core body in the longitudinal direction, and an identification display portion capable of specifying the history of the manufacturing process is formed at a position different from the current collecting lead in the exposed portion. In the core body, the active material layer is arranged at a position opposite to the identification display portion in the thickness direction of the core body.

Description

本開示は、電極板、電極体、及び電池に関する。 The present disclosure relates to an electrode plate, an electrode body, and a battery.

円筒形の非水電解質二次電池等の電池は、正極板と負極板とがセパレータを介して渦巻き状に巻回されてなる巻回型の電極体を備え、電極体が外装体に収容されることにより構成される。正極板及び負極板には、集電リードが接続され、正極板及び負極板は、それぞれ集電リードを介して封口体や、外装缶などに接続されている。 A battery such as a cylindrical non-aqueous electrolyte secondary battery includes a wound electrode body in which a positive electrode plate and a negative electrode plate are spirally wound via a separator, and the electrode body is housed in an outer body. It is composed of. A current collecting lead is connected to the positive electrode plate and the negative electrode plate, and the positive electrode plate and the negative electrode plate are connected to a sealing body, an outer can, or the like via the current collecting lead, respectively.

一方、電池の製造過程や電池の出荷後に、何らかの原因で不具合が発生し、例えば電池が熱によって構成要素の大部分が損傷した等の場合に、不具合の原因解析が困難となる可能性がある。 On the other hand, if a defect occurs for some reason during the battery manufacturing process or after the battery is shipped, for example, if the battery is damaged by heat in most of its components, it may be difficult to analyze the cause of the defect. ..

特許文献１には、電極体において、正極リード、負極リード、正極板の芯体のうち、正極活物質が塗布されていない正極無地部、及び負極板の芯体のうち、負極活物質が塗布されていない負極無地部の少なくとも１つに識別表示を付すことが記載されている。識別表示は、製造工程の履歴を確認することが可能な表示である。高熱によって電池の大部分の構成要素は激しく変形するが、金属材質からなる正極リード、負極リード、及び芯体はほとんど変形しない。これにより、電池の問題発生の際に、識別表示を用いて製造工程の履歴を容易に確認できるので、問題原因分析を容易に行うことが可能とされている。 In Patent Document 1, in the electrode body, the negative electrode active material is applied among the positive electrode lead, the negative electrode lead, the core body of the positive electrode plate, the positive electrode plain portion to which the positive electrode active material is not applied, and the core body of the negative electrode plate. It is described that an identification mark is attached to at least one of the plain negative electrode portions that are not provided. The identification display is a display on which the history of the manufacturing process can be confirmed. Most of the components of the battery are severely deformed by high heat, but the positive electrode lead, the negative electrode lead, and the core made of a metal material are hardly deformed. As a result, when a problem occurs in the battery, the history of the manufacturing process can be easily confirmed by using the identification display, so that the cause of the problem can be easily analyzed.

特開２００６−４０８７５号公報Japanese Unexamined Patent Publication No. 2006-40875

特許文献１に記載された構成において、正極リード及び負極リードの幅は小さいので、正極リードや負極リードに識別表示部を形成することは困難である。また、特許文献１に記載された構成では、正極板及び負極板の芯体の識別表示を形成する部分の剛性が低くなることにより、識別表示を高精度に形成できない可能性がある。これにより、不具合発生時に識別表示を確認しにくくなることにより、識別表示から原因解析を迅速に行えない可能性がある。 In the configuration described in Patent Document 1, since the widths of the positive electrode lead and the negative electrode lead are small, it is difficult to form an identification display portion on the positive electrode lead and the negative electrode lead. Further, in the configuration described in Patent Document 1, there is a possibility that the identification display cannot be formed with high accuracy because the rigidity of the portion forming the identification display of the core body of the positive electrode plate and the negative electrode plate is low. This makes it difficult to confirm the identification display when a problem occurs, and there is a possibility that the cause analysis cannot be performed quickly from the identification display.

本開示は、電極板、電極体及び電池において、不具合発生時に、原因解析を迅速に行えるようにすることを目的とする。 An object of the present disclosure is to enable quick cause analysis when a defect occurs in an electrode plate, an electrode body and a battery.

本開示に係る電極板は、帯状の芯体と、芯体の両面に形成された活物質層とを有し、芯体が露出された露出部に集電リードが接続されており、露出部は、芯体の長手方向一部に配置され、露出部のうち、集電リードとは異なる位置に、製造工程の履歴を特定可能な識別表示部が形成され、芯体において、識別表示部とは芯体の厚み方向の反対側の位置に、活物質層が配置される、電極板である。 The electrode plate according to the present disclosure has a band-shaped core body and active material layers formed on both sides of the core body, and a current collecting lead is connected to an exposed portion where the core body is exposed. Is arranged in a part of the core body in the longitudinal direction, and an identification display unit capable of specifying the history of the manufacturing process is formed at a position different from the current collecting lead in the exposed portion. Is an electrode plate in which the active material layer is arranged at a position opposite to the thickness direction of the core body.

本開示に係る電極体は、少なくとも１つの第１極板と少なくとも１つの第２極板とがセパレータを介して巻回された電極体であって、第１極板が、本開示に係る電極板である、電極体である。 The electrode body according to the present disclosure is an electrode body in which at least one first electrode plate and at least one second electrode plate are wound via a separator, and the first electrode plate is the electrode according to the present disclosure. It is an electrode body, which is a plate.

本開示に係る電池は、本開示に係る電極体と、電極体を収容する有底筒状の外装缶とを備える、電池である。 The battery according to the present disclosure is a battery including an electrode body according to the present disclosure and a bottomed tubular outer can for accommodating the electrode body.

本開示に係る電極板、電極体、及び電池によれば、電極板の芯体の剛性にかかわらず、電極板の識別表示と反対側に活物質層が配置されることで、識別表示を高精度に形成しやすい。これにより、不具合発生時に識別表示を確認しやすくなるので、識別表示から原因解析を迅速に行える。 According to the electrode plate, the electrode body, and the battery according to the present disclosure, the identification display is enhanced by arranging the active material layer on the opposite side to the identification display of the electrode plate regardless of the rigidity of the core body of the electrode plate. Easy to form with precision. This makes it easier to check the identification display when a problem occurs, so that the cause can be quickly analyzed from the identification display.

実施形態の一例の電池の断面図である。It is sectional drawing of the battery of an example of an embodiment. 図１から正極板を取り出して展開状態で示している図である。It is a figure which takes out the positive electrode plate from FIG. 1 and shows it in the developed state. 図１から負極板を取り出して展開状態で示している図である。It is a figure which takes out the negative electrode plate from FIG. 1 and shows it in the developed state. 図２のＡ部拡大図である。It is an enlarged view of the part A of FIG. 図４のＢ−Ｂ断面図である。FIG. 4 is a cross-sectional view taken along the line BB of FIG. 図２に示す正極板に識別表示を形成する方法を示している図である。It is a figure which shows the method of forming the identification display on the positive electrode plate shown in FIG. 実施形態の別例の電池において、負極板の巻き終わり側端部を示している図である。It is a figure which shows the winding end side end portion of the negative electrode plate in the battery of another example of embodiment. 図７のＣ−Ｃ断面図である。FIG. 7 is a cross-sectional view taken along the line CC of FIG.

以下に、本開示に係る実施の形態について添付図面を参照しながら詳細に説明する。以下の説明において、具体的な形状、材料、数値、方向等は、本開示の理解を容易にするための例示であって、電極板、電極体、または電池の仕様に合わせて適宜変更することができる。また、以下において「略」なる用語は、例えば、完全に同じである場合に加えて、実質的に同じとみなせる場合を含む意味で用いられる。さらに、以下において複数の実施形態、変形例が含まれる場合、それらの特徴部分を適宜に組み合わせて用いることは当初から想定されている。 Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the specific shape, material, numerical value, direction, etc. are examples for facilitating the understanding of the present disclosure, and may be appropriately changed according to the specifications of the electrode plate, the electrode body, or the battery. Can be done. Further, in the following, the term "abbreviation" is used to mean, for example, not only when they are completely the same but also when they can be regarded as substantially the same. Further, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that those characteristic portions are used in appropriate combinations.

また、以下では、電池が円筒形の非水電解質二次電池である場合を説明するが、電池はこれに限定するものではなく、他の二次電池、または一次電池であってもよい。 Further, the case where the battery is a cylindrical non-aqueous electrolyte secondary battery will be described below, but the battery is not limited to this, and may be another secondary battery or a primary battery.

図１は、実施形態の電池１０の断面図である。図２は、図１から正極板１２を取り出して展開状態で示している図である。図３は図１から負極板１８を取り出して展開状態で示している図である。図４は、図２のＡ部拡大図である。図５は、図４のＢ−Ｂ断面図である。 FIG. 1 is a cross-sectional view of the battery 10 of the embodiment. FIG. 2 is a diagram showing the positive electrode plate 12 taken out from FIG. 1 in an unfolded state. FIG. 3 is a diagram showing the negative electrode plate 18 taken out from FIG. 1 in an unfolded state. FIG. 4 is an enlarged view of part A of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG.

図１に例示するように、電池１０は、巻回型の電極体１１及び非水電解質（図示せず）を含む発電要素と、外装缶５１とを備える。巻回型の電極体１１は、少なくとも１つの正極板１２と、少なくとも１つの負極板１８と、セパレータ２５とを有し、正極板１２と負極板１８がセパレータ２５を介して渦巻状に巻回されている。正極板１２及び負極板１８は、電極板に相当する。また、正極板１２は第１極板に相当し、負極板１８は第２極板に相当する。以下では、電極体１１の軸方向一方側を「上」、軸方向他方側を「下」という場合がある。非水電解質は、非水溶媒と、非水溶媒に溶解した電解質塩とを含む。非水電解質は、液体電解質に限定されず、ゲル状ポリマー等を用いた固体電解質であってもよい。 As illustrated in FIG. 1, the battery 10 includes a winding electrode body 11, a power generation element including a non-aqueous electrolyte (not shown), and an outer can 51. The winding type electrode body 11 has at least one positive electrode plate 12, at least one negative electrode plate 18, and a separator 25, and the positive electrode plate 12 and the negative electrode plate 18 are spirally wound via the separator 25. Has been done. The positive electrode plate 12 and the negative electrode plate 18 correspond to electrode plates. Further, the positive electrode plate 12 corresponds to the first electrode plate, and the negative electrode plate 18 corresponds to the second electrode plate. In the following, one side in the axial direction of the electrode body 11 may be referred to as “upper”, and the other side in the axial direction may be referred to as “lower”. The non-aqueous electrolyte contains a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. The non-aqueous electrolyte is not limited to the liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.

正極板１２は、帯状の正極芯体１３（図２、図４、図５）と、正極芯体１３に接合された正極リード１７とを有する。正極リード１７は、正極芯体１３と正極端子を電気的に接続するための導電部材であって、電極群の上端から電極体１１の軸方向αの一方側（上方）に延出している。ここで、電極群とは電極体１１において各リードを除く部分を意味する。正極リード１７は、例えば電極体１１の径方向βの略中央部に設けられている。 The positive electrode plate 12 has a strip-shaped positive electrode core 13 (FIGS. 2, 4 and 5) and a positive electrode lead 17 joined to the positive electrode core 13. The positive electrode lead 17 is a conductive member for electrically connecting the positive electrode core body 13 and the positive electrode terminal, and extends from the upper end of the electrode group to one side (upper side) of the axial direction α of the electrode body 11. Here, the electrode group means a portion of the electrode body 11 excluding each reed. The positive electrode lead 17 is provided, for example, at a substantially central portion of the electrode body 11 in the radial direction β.

負極板１８は、帯状の負極芯体１９（図３）と、負極芯体１９に接続された２つの負極リード２２ａ，２２ｂとを有する。各負極リード２２ａ，２２ｂは、負極芯体１９と負極端子を電気的に接続するための導電部材であって、電極群の下端から電極体１１の軸方向αの他方側（下方）に延出している。例えば、２つの負極リード２２ａ、２２ｂの一方の負極リード２２ａは電極体１１の巻き始め側端部に設けられ、他方の負極リード２２ｂは電極体１１の巻き終わり側端部に設けられている。 The negative electrode plate 18 has a strip-shaped negative electrode core body 19 (FIG. 3) and two negative electrode leads 22a and 22b connected to the negative electrode core body 19. Each of the negative electrode leads 22a and 22b is a conductive member for electrically connecting the negative electrode core body 19 and the negative electrode terminal, and extends from the lower end of the electrode group to the other side (downward) of the electrode body 11 in the axial direction α. ing. For example, one of the two negative electrode leads 22a and 22b is provided at the winding start side end of the electrode body 11, and the other negative electrode lead 22b is provided at the winding end side end of the electrode body 11.

正極リード１７及び各負極リード２２ａ，２２ｂは、集電リードに相当する。正極リード１７及び各負極リード２２ａ，２２ｂは、それぞれに対応する芯体よりも厚みの大きい帯状の導電部材である。各リードの厚みは、例えば芯体の厚みの３倍〜３０倍であって、一般的には５０μｍ〜５００μｍである。各リードの構成材料は特に限定されない。正極リード１７はアルミニウムを主成分とする金属によって、負極リード２２ａ，２２ｂはニッケル又は銅を主成分とする金属によって、または、ニッケル及び銅の両方を含む金属によって、それぞれ構成されることが好ましい。なお、負極リード２２ａ、２２ｂのうち、一方の負極リードは省略されてもよい。 The positive electrode lead 17 and the negative electrode leads 22a and 22b correspond to current collecting leads. The positive electrode lead 17 and the negative electrode leads 22a and 22b are strip-shaped conductive members having a thickness larger than the corresponding core body. The thickness of each lead is, for example, 3 to 30 times the thickness of the core body, and is generally 50 μm to 500 μm. The constituent material of each reed is not particularly limited. It is preferable that the positive electrode lead 17 is composed of a metal containing aluminum as a main component, and the negative electrode leads 22a and 22b are composed of a metal containing nickel or copper as a main component, or a metal containing both nickel and copper. Of the negative electrode leads 22a and 22b, one of the negative electrode leads may be omitted.

図１に示す例では、外装缶５１と封口体５２によって、電極体１１及び非水電解質を収容する金属製の電池ケースが構成されている。電極体１１の上下には、絶縁板５３，５４がそれぞれ設けられる。正極リード１７は上側の絶縁板５３の貫通孔を通って封口体５２側に延び、封口体５２の底板であるフィルタ５７の下面に溶接される。電池１０では、フィルタ５７と電気的に接続された封口体５２の天板であるキャップ６１が正極端子となる。他方、負極リード２２ａは下側の絶縁板５４の貫通孔を通り、負極リード２２ｂは下側の絶縁板５４の外側を通って、外装缶５１の底部側に延び、外装缶５１の底部内面に溶接される。電池１０では、外装缶５１が負極端子となる。 In the example shown in FIG. 1, the outer can 51 and the sealing body 52 constitute a metal battery case for accommodating the electrode body 11 and the non-aqueous electrolyte. Insulating plates 53 and 54 are provided above and below the electrode body 11, respectively. The positive electrode lead 17 extends to the sealing body 52 side through the through hole of the upper insulating plate 53 and is welded to the lower surface of the filter 57 which is the bottom plate of the sealing body 52. In the battery 10, the cap 61, which is the top plate of the sealing body 52 electrically connected to the filter 57, serves as the positive electrode terminal. On the other hand, the negative electrode lead 22a passes through the through hole of the lower insulating plate 54, the negative electrode lead 22b passes through the outside of the lower insulating plate 54, extends to the bottom side of the outer can 51, and reaches the inner surface of the bottom of the outer can 51. Will be welded. In the battery 10, the outer can 51 serves as a negative electrode terminal.

電極体１１は、上述の通り、正極板１２と負極板１８がセパレータ２５を介して渦巻状に巻回されてなる巻回構造を有する。正極板１２、負極板１８、及びセパレータ２５は、いずれも帯状に形成され、渦巻状に巻回されることで電極体１１の径方向βに交互に積層された状態となる。電極体１１において、各電極板の長手方向が巻き方向γ（図２、図３）となり、各電極板の幅方向が軸方向αとなる。図２、図３では、各電極板を展開状態で示しており、紙面左側が電極体１１の巻き始め側、紙面右側が電極体１１の巻き終わり側である。 As described above, the electrode body 11 has a winding structure in which the positive electrode plate 12 and the negative electrode plate 18 are spirally wound via the separator 25. The positive electrode plate 12, the negative electrode plate 18, and the separator 25 are all formed in a band shape, and are wound in a spiral shape so as to be alternately laminated in the radial direction β of the electrode body 11. In the electrode body 11, the longitudinal direction of each electrode plate is the winding direction γ (FIGS. 2 and 3), and the width direction of each electrode plate is the axial direction α. In FIGS. 2 and 3, each electrode plate is shown in an unfolded state, and the left side of the paper surface is the winding start side of the electrode body 11, and the right side of the paper surface is the winding end side of the electrode body 11.

外装缶５１は、有底円筒形状の金属製容器である。外装缶５１と封口体５２の間にはガスケット６２が設けられ、電池ケース内の密閉性が確保されている。外装缶５１は、例えば側面部を外側からプレスして形成された、封口体５２を支持する張り出し部５６を有する。張り出し部５６は、外装缶５１の周方向に沿って環状に形成されることが好ましく、その上面で封口体５２を支持する。これにより、封口体５２は、外装缶５１の開口部を塞ぐ。 The outer can 51 is a metal container having a bottomed cylindrical shape. A gasket 62 is provided between the outer can 51 and the sealing body 52 to ensure the airtightness inside the battery case. The outer can 51 has, for example, an overhanging portion 56 that supports the sealing body 52, which is formed by pressing a side surface portion from the outside. The overhanging portion 56 is preferably formed in an annular shape along the circumferential direction of the outer can 51, and the sealing body 52 is supported on the upper surface thereof. As a result, the sealing body 52 closes the opening of the outer can 51.

封口体５２は、電極体１１側から順に積層された、フィルタ５７、下弁体５８、絶縁部材５９、上弁体６０、及びキャップ６１を有する。封口体５２を構成する各部材は、例えば円板形状又はリング形状を有し、絶縁部材５９を除く各部材は互いに電気的に接続されている。下弁体５８と上弁体６０とは各々の中央部で互いに接続され、各々の周縁部の間には絶縁部材５９が介在している。異常発熱で電池の内圧が上昇すると、例えば下弁体５８が破断し、これにより上弁体６０がキャップ６１側に膨れて下弁体５８から離れることにより両者の電気的接続が遮断される。さらに内圧が上昇すると、上弁体６０が破断し、キャップ６１の開口部６１ａからガスが排出される。 The sealing body 52 has a filter 57, a lower valve body 58, an insulating member 59, an upper valve body 60, and a cap 61, which are laminated in order from the electrode body 11 side. Each member constituting the sealing body 52 has, for example, a disk shape or a ring shape, and each member except the insulating member 59 is electrically connected to each other. The lower valve body 58 and the upper valve body 60 are connected to each other at the central portion thereof, and an insulating member 59 is interposed between the peripheral portions thereof. When the internal pressure of the battery rises due to abnormal heat generation, for example, the lower valve body 58 breaks, which causes the upper valve body 60 to swell toward the cap 61 side and separate from the lower valve body 58, thereby cutting off the electrical connection between the two. When the internal pressure further rises, the upper valve body 60 breaks and gas is discharged from the opening 61a of the cap 61.

以下、図２〜図５を参照しながら、電極体１１について詳しく説明する。正極板１２は、帯状の正極芯体１３と、正極芯体１３上に形成された正極活物質層１４，１５とを有する。本実施形態では、正極芯体１３の両面に正極活物質層１４，１５が形成されている。正極芯体１３の図２の紙面の表側面である第１面１３ａには正極活物質層１４が形成される。正極芯体１３の図２の紙面の裏側面である第２面１３ｂには正極活物質層１５が形成される。図２、図４では正極活物質層１４を砂地で示している。正極芯体１３には、例えばアルミニウムなどの金属の箔、当該金属を表層に配置したフィルム等が用いられる。好適な正極芯体１３は、アルミニウム又はアルミニウム合金を主成分とする金属の箔である。正極芯体１３の厚みは、例えば１０μｍ〜３０μｍである。 Hereinafter, the electrode body 11 will be described in detail with reference to FIGS. 2 to 5. The positive electrode plate 12 has a strip-shaped positive electrode core body 13 and positive electrode active material layers 14 and 15 formed on the positive electrode core body 13. In the present embodiment, the positive electrode active material layers 14 and 15 are formed on both sides of the positive electrode core body 13. The positive electrode active material layer 14 is formed on the first surface 13a, which is the front side surface of the paper surface of FIG. 2 of the positive electrode core body 13. The positive electrode active material layer 15 is formed on the second surface 13b, which is the back surface of the paper surface of FIG. 2 of the positive electrode core body 13. In FIGS. 2 and 4, the positive electrode active material layer 14 is shown as sand. For the positive electrode core body 13, for example, a metal foil such as aluminum, a film on which the metal is arranged on the surface layer, or the like is used. A suitable positive electrode core 13 is a metal foil containing aluminum or an aluminum alloy as a main component. The thickness of the positive electrode core 13 is, for example, 10 μm to 30 μm.

正極活物質層１４，１５は、正極芯体１３の両面において、後述の芯体露出部１２ａを除く全域に形成されることが好適である。正極活物質層１４，１５は、正極活物質、導電剤、及び結着剤を含むことが好ましい。正極板１２は、正極活物質、導電剤、結着剤、及びＮ−メチル−２−ピロリドン（ＮＭＰ）等の溶剤を含む正極合剤スラリーを正極芯体１３の両面に塗布した後、乾燥および圧延することにより作製される。 It is preferable that the positive electrode active material layers 14 and 15 are formed on both sides of the positive electrode core body 13 in the entire area except for the core body exposed portion 12a described later. The positive electrode active material layers 14 and 15 preferably contain a positive electrode active material, a conductive agent, and a binder. The positive electrode plate 12 is dried after applying a positive electrode mixture slurry containing a positive electrode active material, a conductive agent, a binder, and a solvent such as N-methyl-2-pyrrolidone (NMP) on both surfaces of the positive electrode core body 13. It is produced by rolling.

正極活物質としては、Ｃｏ、Ｍｎ、Ｎｉ等の遷移金属元素を含有するリチウム含有遷移金属酸化物が例示できる。リチウム含有遷移金属酸化物は、特に限定されないが、一般式Ｌｉ1+xＭＯ2（式中、−０．２＜ｘ≦０．２、ＭはＮｉ、Ｃｏ、Ｍｎ、Ａｌの少なくとも１種を含む）で表される複合酸化物であることが好ましい。Examples of the positive electrode active material include lithium-containing transition metal oxides containing transition metal elements such as Co, Mn, and Ni. The lithium-containing transition metal oxide is not particularly limited, but the general formula Li 1 + x MO 2 (in the formula, −0.2 <x ≦ 0.2, M is at least one of Ni, Co, Mn, and Al). It is preferably a composite oxide represented by).

上記導電剤の例としては、カーボンブラック（ＣＢ）、アセチレンブラック（ＡＢ）、ケッチェンブラック、黒鉛等の炭素材料などが挙げられる。上記結着剤の例としては、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリフッ化ビニリデン（ＰＶｄＦ）等のフッ素系樹脂、ポリアクリロニトリル（ＰＡＮ）、ポリイミド（ＰＩ）、アクリル系樹脂、ポリオレフィン系樹脂などが挙げられる。また、これらの樹脂と、カルボキシメチルセルロース（ＣＭＣ）又はその塩、ポリエチレンオキシド（ＰＥＯ）等が併用されてもよい。これらは、１種類を単独で用いてもよく、２種類以上を組み合わせて用いてもよい。 Examples of the conductive agent include carbon materials such as carbon black (CB), acetylene black (AB), Ketjen black, and graphite. Examples of the binder include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide (PI), acrylic resins, and polyolefin resins. Be done. Further, these resins may be used in combination with carboxymethyl cellulose (CMC) or a salt thereof, polyethylene oxide (PEO) and the like. One of these may be used alone, or two or more of them may be used in combination.

正極板１２の第１面１３ａには、正極芯体１３を構成する金属の表面が露出した芯体露出部１２ａが設けられる。芯体露出部１２ａは正極リード１７が接続される部分であって、正極芯体１３の表面が正極活物質層１４，１５に覆われていない部分である。芯体露出部１２ａは、正極リード１７よりも幅広に形成される。図２に示す例では、正極板１２の長手方向中央部に、正極芯体１３の幅方向全長にわたって芯体露出部１２ａが設けられている。これにより、芯体露出部１２ａは、正極芯体１３の長手方向中央部において、長手方向両側の２つの正極活物質層１４の間に配置される。芯体露出部１２ａは、正極板１２の長手方向端部寄りに形成されてもよいが、集電性の観点から、好ましくは長手方向両端から略等距離の位置に設けられるのが好ましい。このような位置に設けられた芯体露出部１２ａに正極リード１７が接続されることで、電極体１１として巻回されたとき、正極リード１７は、電極体１１の径方向中間位置で軸方向端面から上方に突出して配置される。芯体露出部１２ａは、例えば正極芯体１３の一部に正極合剤スラリーを塗布しない間欠塗布により設けられる。なお、芯体露出部１２ａは正極板１２の上端から下端に至らない長さで設けられてもよい。 The first surface 13a of the positive electrode plate 12 is provided with a core body exposed portion 12a in which the surface of the metal constituting the positive electrode core body 13 is exposed. The core body exposed portion 12a is a portion to which the positive electrode leads 17 are connected, and the surface of the positive electrode core body 13 is not covered with the positive electrode active material layers 14 and 15. The core body exposed portion 12a is formed wider than the positive electrode lead 17. In the example shown in FIG. 2, a core body exposed portion 12a is provided at the central portion in the longitudinal direction of the positive electrode plate 12 over the entire length in the width direction of the positive electrode core body 13. As a result, the core body exposed portion 12a is arranged between the two positive electrode active material layers 14 on both sides in the longitudinal direction in the central portion in the longitudinal direction of the positive electrode core body 13. The core body exposed portion 12a may be formed near the end portion in the longitudinal direction of the positive electrode plate 12, but from the viewpoint of current collection, it is preferably provided at a position substantially equidistant from both ends in the longitudinal direction. By connecting the positive electrode lead 17 to the core body exposed portion 12a provided at such a position, when the positive electrode lead 17 is wound as the electrode body 11, the positive electrode lead 17 is axially intermediate at the radial intermediate position of the electrode body 11. It is arranged so as to project upward from the end face. The core body exposed portion 12a is provided, for example, by intermittent coating in which the positive electrode mixture slurry is not applied to a part of the positive electrode core body 13. The core body exposed portion 12a may be provided with a length that does not reach from the upper end to the lower end of the positive electrode plate 12.

図５に示すように、正極芯体１３の第２面１３ｂにおいて、芯体露出部１２ａとは正極芯体１３の厚み方向の反対側の位置には、正極活物質層１５が配置される。識別表示部３５は芯体露出部１２ａに形成されており、第２テープ３２により覆われている。正極リード１７は、例えば、レーザ溶接、超音波溶接等によって芯体露出部１２ａに接合される。このとき、正極リード１７の正極芯体１３から導出する部分と、正極リード１７の正極芯体１３に接続された部分とが、第１テープ３１（図４）及び第２テープ３２により覆われている。第１テープ３１は、正極リード１７のうち、正極芯体１３から導出する部分と正極芯体１３に重なる部分との周囲に巻かれるように正極リード１７に貼着されている。第２テープ３２は、正極リード１７の第１テープ３１で巻かれた部分を含んだ芯体露出部１２ａに重なった部分と、正極活物質層１４，１５の一部とを覆うように、正極板１２の厚み方向両側から２枚で挟んでいる。そして、２枚の第２テープ３２が、正極板１２の幅方向（図４の上下方向）両端からはみ出た部分で接着されている。これにより、第２テープ３２は、芯体露出部１２ａを覆うように正極板１２に貼着される。第１テープ３１及び第２テープ３２は、絶縁材料により形成される。各テープ３１，３２は、例えばポリプロピレン（ＰＰ）等の樹脂製である。これらの第１テープ３１及び第２テープ３２によって、正極板１２及び負極板１８間のセパレータ２５が裂けた場合における内部短絡を防止できる。また、芯体露出部１２ａに形成された後述の識別表示部３５が、正極リード１７とともに、第２テープ３２により覆われる。これにより、この識別表示部３５の損傷を防止しやすくなる。図４では、第１テープ３１及び第２テープ３２を透明状としているが、半透明、または非透明としてもよい。 As shown in FIG. 5, the positive electrode active material layer 15 is arranged on the second surface 13b of the positive electrode core 13 at a position opposite to the exposed core 12a in the thickness direction of the positive electrode core 13. The identification display portion 35 is formed on the core body exposed portion 12a and is covered with the second tape 32. The positive electrode lead 17 is bonded to the core body exposed portion 12a by, for example, laser welding, ultrasonic welding, or the like. At this time, the portion of the positive electrode lead 17 led out from the positive electrode core 13 and the portion of the positive electrode lead 17 connected to the positive electrode core 13 are covered with the first tape 31 (FIG. 4) and the second tape 32. There is. The first tape 31 is attached to the positive electrode lead 17 so as to be wound around a portion of the positive electrode lead 17 that is led out from the positive electrode core 13 and a portion that overlaps the positive electrode core 13. The second tape 32 covers the portion of the positive electrode lead 17 that overlaps the exposed core body 12a including the portion wound by the first tape 31, and a part of the positive electrode active material layers 14, 15 so as to cover the positive electrode. It is sandwiched between two plates from both sides in the thickness direction of the plate 12. Then, the two second tapes 32 are adhered to each other at the portions protruding from both ends in the width direction (vertical direction in FIG. 4) of the positive electrode plate 12. As a result, the second tape 32 is attached to the positive electrode plate 12 so as to cover the exposed core body 12a. The first tape 31 and the second tape 32 are formed of an insulating material. Each of the tapes 31 and 32 is made of a resin such as polypropylene (PP). The first tape 31 and the second tape 32 can prevent an internal short circuit when the separator 25 between the positive electrode plate 12 and the negative electrode plate 18 is torn. Further, the identification display portion 35, which will be described later, formed on the core body exposed portion 12a is covered with the second tape 32 together with the positive electrode lead 17. This makes it easier to prevent damage to the identification display unit 35. In FIG. 4, the first tape 31 and the second tape 32 are transparent, but they may be translucent or non-transparent.

実施形態では、芯体露出部１２ａのうち、正極リード１７とは異なる位置に、製造工程の履歴を特定可能な識別表示部３５が形成される。具体的には、正極リード１７の一端（図４の下端）は、芯体露出部１２ａの幅方向一端（図４の下端）から幅方向他方側（図４の上側）に離れている。そして、芯体露出部１２ａのうち、正極リード１７が配置されない幅方向一端部（図４の下端部）に識別表示部３５が形成される。図２、図４では、識別表示部３５として二次元コードであるＱＲコード（登録商標）が示されている。識別表示部３５は、製造工程の履歴として、例えば生産設備、生産ライン、作業者、生産日付の少なくとも１つの情報が含まれる。電池１０の異常による高熱の影響によって、電池１０の大部分の構成要素が変形する等の場合でも、内部の金属材料からなる正極芯体１３等の電極板は変形しにくい。このため、電池１０の不具合発生時に製造工程の履歴を確認可能とすることで、不具合の原因を迅速に解析しやすくなる。識別表示部は、二次元コード以外に、数字、文字、または数字及び文字の組み合わせで構成されてもよい。また、識別表示部は、突起、孔、または突起及び孔の組み合わせで構成されてもよい。また、識別表示部は、バーコード等の一次元コードであってもよい。 In the embodiment, the identification display unit 35 capable of specifying the history of the manufacturing process is formed at a position different from the positive electrode lead 17 in the core body exposed portion 12a. Specifically, one end (lower end of FIG. 4) of the positive electrode lead 17 is separated from one end in the width direction (lower end of FIG. 4) of the core body exposed portion 12a to the other side (upper end of FIG. 4) in the width direction. Then, the identification display portion 35 is formed at one end portion (lower end portion in FIG. 4) in the width direction in which the positive electrode lead 17 is not arranged in the core body exposed portion 12a. In FIGS. 2 and 4, a QR code (registered trademark), which is a two-dimensional code, is shown as the identification display unit 35. The identification display unit 35 includes at least one piece of information such as a production facility, a production line, a worker, and a production date as a history of the manufacturing process. Even when most of the components of the battery 10 are deformed due to the influence of high heat due to the abnormality of the battery 10, the electrode plate such as the positive electrode core 13 made of the internal metal material is not easily deformed. Therefore, by making it possible to confirm the history of the manufacturing process when a defect occurs in the battery 10, it becomes easy to quickly analyze the cause of the defect. The identification display unit may be composed of numbers, characters, or a combination of numbers and characters, in addition to the two-dimensional code. Further, the identification display unit may be composed of protrusions, holes, or a combination of protrusions and holes. Further, the identification display unit may be a one-dimensional code such as a bar code.

上記のように正極芯体１３において、芯体露出部１２ａとは正極芯体１３の厚み方向の反対側の位置に、正極活物質層１５が配置される。これにより、図５に示すように、正極芯体１３において、識別表示部３５とは正極芯体１３の厚み方向の反対側の位置には、正極活物質層１５が配置される。 As described above, in the positive electrode core body 13, the positive electrode active material layer 15 is arranged at a position opposite to the exposed core body 12a in the thickness direction of the positive electrode core body 13. As a result, as shown in FIG. 5, in the positive electrode core body 13, the positive electrode active material layer 15 is arranged at a position opposite to the identification display unit 35 in the thickness direction of the positive electrode core body 13.

また、実施形態では、識別表示部３５は、レーザマーキングで形成される。レーザマーキングは、レーザ光による非接触式マーキングであり、静電気の発生がなく、高速でのマーキング作業が可能であり、耐摩耗性に優れる。図６は、正極板１２に識別表示を形成する方法を示している図である。識別表示を形成する際には、図６に示すように、ゴム、金属等からなるローラ３６で、正極リード及び識別表示部を設ける前の正極板１２を、一方向（図６の矢印η方向）に搬送する。この搬送において、ローラ３６で裏側（図６の下側）の正極活物質層１５を介して支えながら芯体露出部１２ａにレーザ光３８を照射することにより、識別表示部３５（図４）を形成する。上記のように、芯体露出部１２ａの裏側には正極活物質層１５が配置されるので、正極板１２において識別表示が形成される部分の剛性を高くできる。これにより、識別表示を高精度に形成しやすい。 Further, in the embodiment, the identification display unit 35 is formed by laser marking. The laser marking is a non-contact marking by a laser beam, does not generate static electricity, enables high-speed marking work, and has excellent wear resistance. FIG. 6 is a diagram showing a method of forming an identification display on the positive electrode plate 12. When forming the identification display, as shown in FIG. 6, a roller 36 made of rubber, metal, or the like is used to move the positive electrode plate 12 before providing the positive electrode lead and the identification display unit in one direction (arrow η direction in FIG. 6). ). In this transfer, the identification display unit 35 (FIG. 4) is irradiated by irradiating the core body exposed portion 12a with the laser beam 38 while being supported by the roller 36 via the positive electrode active material layer 15 on the back side (lower side of FIG. 6). Form. As described above, since the positive electrode active material layer 15 is arranged on the back side of the core body exposed portion 12a, the rigidity of the portion of the positive electrode plate 12 on which the identification display is formed can be increased. This makes it easy to form the identification display with high accuracy.

なお、識別表示部は、このようなレーザマーキングで形成する場合に限定せず、例えばインクジェット印刷により形成されてもよい。この場合でも、識別表示を形成する際に、芯体露出部１２ａの裏側に正極活物質層１５が配置されることにより、識別表示が形成される部分の剛性を高くでき、識別表示を高精度に形成できる。 The identification display unit is not limited to the case where it is formed by such laser marking, and may be formed by, for example, inkjet printing. Even in this case, when the identification display is formed, the positive electrode active material layer 15 is arranged on the back side of the core body exposed portion 12a, so that the rigidity of the portion where the identification display is formed can be increased, and the identification display can be made highly accurate. Can be formed into.

次に、図３を用いて負極板１８の構成を説明する。負極板１８は、帯状の負極芯体１９と、負極芯体１９上に形成された負極活物質層２０とを有する。本実施形態では、負極芯体１９の両面に負極活物質層２０が形成されている。負極芯体１９には、例えば銅などの金属の箔、当該金属を表層に配置したフィルム等が用いられる。負極芯体１９の厚みは、例えば５μｍ〜３０μｍである。 Next, the configuration of the negative electrode plate 18 will be described with reference to FIG. The negative electrode plate 18 has a strip-shaped negative electrode core body 19 and a negative electrode active material layer 20 formed on the negative electrode core body 19. In the present embodiment, the negative electrode active material layers 20 are formed on both sides of the negative electrode core body 19. For the negative electrode core body 19, for example, a metal foil such as copper, a film on which the metal is arranged on the surface layer, or the like is used. The thickness of the negative electrode core 19 is, for example, 5 μm to 30 μm.

負極活物質層２０は、負極芯体１９の両面において、芯体露出部１８ａ、１８ｂを除く全域に形成されることが好適である。負極活物質層２０は、負極活物質及び結着剤を含むことが好ましい。負極板１８は、例えば負極活物質、結着剤、及び水等を含む負極合剤スラリーを負極芯体の両面に塗布した後、乾燥および圧延することにより作製される。 It is preferable that the negative electrode active material layer 20 is formed on both sides of the negative electrode core body 19 in the entire area except for the core body exposed portions 18a and 18b. The negative electrode active material layer 20 preferably contains a negative electrode active material and a binder. The negative electrode plate 18 is produced by applying, for example, a negative electrode mixture slurry containing a negative electrode active material, a binder, water, and the like to both surfaces of a negative electrode core body, and then drying and rolling.

負極活物質としては、リチウムイオンを可逆的に吸蔵、放出できるものであれば特に限定されず、例えば天然黒鉛、人造黒鉛等の炭素材料、Ｓｉ、Ｓｎ等のリチウムと合金化する金属、又はこれらを含む合金、複合酸化物などを用いることができる。負極活物質層２０に含まれる結着剤には、例えば正極板１２の場合と同様の樹脂が用いられる。水系溶媒で負極合剤スラリーを調製する場合は、スチレン−ブタジエンゴム（ＳＢＲ）、ＣＭＣ又はその塩、ポリアクリル酸又はその塩、ポリビニルアルコール等を用いることができる。これらは、１種類を単独で用いてもよく、２種類以上を組み合わせて用いてもよい。 The negative electrode active material is not particularly limited as long as it can reversibly occlude and release lithium ions, for example, a carbon material such as natural graphite or artificial graphite, a metal alloying with lithium such as Si or Sn, or these. Alloys containing, composite oxides and the like can be used. As the binder contained in the negative electrode active material layer 20, for example, the same resin as in the case of the positive electrode plate 12 is used. When preparing a negative electrode mixture slurry with an aqueous solvent, styrene-butadiene rubber (SBR), CMC or a salt thereof, polyacrylic acid or a salt thereof, polyvinyl alcohol and the like can be used. One of these may be used alone, or two or more of them may be used in combination.

負極板１８の巻き始め側端部と巻き終わり側端部とである長手方向両端部には、負極芯体１９を構成する金属の表面が露出した芯体露出部１８ａ、１８ｂが設けられる。芯体露出部１８ａ、１８ｂは、負極リード２２ａ、２２ｂがそれぞれ接続される部分であって、負極芯体１９の表面が負極活物質層２０に覆われていない部分である。芯体露出部１８ａ、１８ｂは、負極板１８の幅方向に沿って長く延びた正面視略矩形形状であり、各負極リード２２ａ、２２ｂよりも幅広に形成される。負極板１８の巻き終わり側の芯体露出部１８ｂは、負極芯体１９の長手方向一端（図３の右端）から長手方向の所定幅にわたる部分に配置される。負極板１８の巻き始め側の芯体露出部１８ａは、負極芯体１９の長手方向他端（図３の左端）から長手方向の所定幅にわたる部分に配置される。 Core body exposed portions 18a and 18b having exposed metal surfaces constituting the negative electrode core body 19 are provided at both ends in the longitudinal direction, which are the winding start side end portion and the winding end side end portion of the negative electrode plate 18. The core body exposed portions 18a and 18b are portions to which the negative electrode leads 22a and 22b are connected, respectively, and the surface of the negative electrode core body 19 is not covered with the negative electrode active material layer 20. The core body exposed portions 18a and 18b have a substantially rectangular shape in front view extending long along the width direction of the negative electrode plate 18, and are formed wider than the negative electrode leads 22a and 22b. The exposed core body 18b on the winding end side of the negative electrode plate 18 is arranged in a portion extending from one end in the longitudinal direction (right end in FIG. 3) of the negative electrode core 19 to a predetermined width in the longitudinal direction. The core body exposed portion 18a on the winding start side of the negative electrode plate 18 is arranged in a portion extending from the other end in the longitudinal direction (left end in FIG. 3) of the negative electrode core body 19 to a predetermined width in the longitudinal direction.

本実施形態では、２つの負極リード２２ａ，２２ｂは、負極芯体１９の外周側の表面に例えば超音波溶接、レーザ溶接等により接合されている。各負極リード２２ａ、２２ｂの上端部は芯体露出部１８ａ、１８ｂ上に配置され、下端部は芯体露出部１８ａ、１８ｂの下端から下方に延出している。 In this embodiment, the two negative electrode leads 22a and 22b are bonded to the outer peripheral surface of the negative electrode core 19 by, for example, ultrasonic welding or laser welding. The upper end portions of the negative electrode leads 22a and 22b are arranged on the core body exposed portions 18a and 18b, and the lower end portions extend downward from the lower ends of the core body exposed portions 18a and 18b.

図３に示す例では、負極板１８の長手方向両端部（すなわち、巻き始め側端部及び巻き終わり側端部）に、負極芯体１９の幅方向全長にわたって芯体露出部１８ａ、１８ｂがそれぞれ設けられている。負極リード２２ａは負極板１８の巻き始め側端部の芯体露出部１８ａに設けられ、負極リード２２ｂは負極板１８の巻き終わり側端部の芯体露出部１８ｂに設けられている。このように負極リード２２ａ，２２ｂを負極板１８の長手方向両端部に設けることで、集電性が向上する。負極リードの配置方法はこれに限定されるものではなく、負極板１８の巻き始め側端部だけに負極リード２２ａを設けてもよい。この場合、巻き終わり側端部の芯体露出部を外装缶５１の内周面に直接に接触させる構成とするのが好ましい。各芯体露出部１８ａ、１８ｂは、例えば負極芯体の一部に負極合剤スラリーを塗布しない間欠塗布により設けられる。 In the example shown in FIG. 3, core body exposed portions 18a and 18b are provided at both ends in the longitudinal direction (that is, the winding start side end portion and the winding end side end portion) of the negative electrode plate 18 over the entire width direction of the negative electrode core body 19, respectively. It is provided. The negative electrode lead 22a is provided on the core body exposed portion 18a at the winding start side end of the negative electrode plate 18, and the negative electrode lead 22b is provided on the core body exposed portion 18b at the winding end side end of the negative electrode plate 18. By providing the negative electrode leads 22a and 22b at both ends in the longitudinal direction of the negative electrode plate 18 in this way, the current collecting property is improved. The method of arranging the negative electrode leads is not limited to this, and the negative electrode leads 22a may be provided only at the winding start side end portion of the negative electrode plate 18. In this case, it is preferable that the exposed core body end portion on the winding end side is in direct contact with the inner peripheral surface of the outer can 51. The exposed core bodies 18a and 18b are provided, for example, by intermittent coating in which the negative electrode mixture slurry is not applied to a part of the negative electrode core body.

負極リード２２ａ、２２ｂの一部にも、正極板１２の場合と同様に、第１テープ４０（図７、図８参照）が貼着され、負極板１８の一部にも、正極板１２の場合と同様に、芯体露出部１８ａ、１８ｂを覆うように、第２テープ４２が貼着される。図３では、負極リード２２ａ、２２ｂに貼着する第１テープの図示を省略する。 The first tape 40 (see FIGS. 7 and 8) is also attached to a part of the negative electrode leads 22a and 22b as in the case of the positive electrode plate 12, and the positive electrode plate 12 is also attached to a part of the negative electrode plate 18. As in the case, the second tape 42 is attached so as to cover the exposed core bodies 18a and 18b. In FIG. 3, the first tape to be attached to the negative electrode leads 22a and 22b is not shown.

図１に戻って、セパレータ２５には、イオン透過性及び絶縁性を有する多孔性シートが用いられる。多孔性シートの具体例としては、微多孔薄膜、織布、不織布などが挙げられる。セパレータ２５の材質としては、ポリエチレン、ポリプロピレン等のオレフィン樹脂が好ましい。セパレータ２５の厚みは、例えば１０μｍ〜５０μｍである。 Returning to FIG. 1, a porous sheet having ion permeability and insulating property is used for the separator 25. Specific examples of the porous sheet include a microporous thin film, a woven fabric, and a non-woven fabric. As the material of the separator 25, an olefin resin such as polyethylene or polypropylene is preferable. The thickness of the separator 25 is, for example, 10 μm to 50 μm.

上記の正極板１２、電極体１１、及び電池１０によれば、正極板１２の芯体の剛性にかかわらず、正極板１２において識別表示と反対側に正極活物質層１５が配置されることで、識別表示が形成される部分の剛性を高くできる。これにより、識別表示を高精度に形成できる。このため、電池１０の製造過程や電池１０の出荷後における不具合発生時に識別表示を確認しやすくなる。例えば、識別表示部３５が二次元コードまたは一次元コードの場合、そのコードを、読取装置で読み取ることにより、製造履歴を迅速に確認できる。これにより、識別表示から不具合の原因解析を迅速に行える。一方、特許文献１に記載された構成では、負極板の芯体において、識別表示とは芯体の厚み方向反対側の位置には負極活物質層が配置されない。これにより、識別表示が形成される部分の剛性が低くなる。このため、特許文献１に記載された構成では、識別表示を高精度に形成できない可能性がある。 According to the positive electrode plate 12, the electrode body 11, and the battery 10, the positive electrode active material layer 15 is arranged on the opposite side of the positive electrode plate 12 from the identification display regardless of the rigidity of the core body of the positive electrode plate 12. , The rigidity of the portion where the identification display is formed can be increased. As a result, the identification display can be formed with high accuracy. Therefore, it becomes easy to confirm the identification display when a problem occurs during the manufacturing process of the battery 10 or after the battery 10 is shipped. For example, when the identification display unit 35 is a two-dimensional code or a one-dimensional code, the manufacturing history can be quickly confirmed by reading the code with a reading device. As a result, the cause of the defect can be quickly analyzed from the identification display. On the other hand, in the configuration described in Patent Document 1, in the core body of the negative electrode plate, the negative electrode active material layer is not arranged at a position opposite to the identification display in the thickness direction of the core body. As a result, the rigidity of the portion where the identification display is formed is reduced. Therefore, with the configuration described in Patent Document 1, there is a possibility that the identification display cannot be formed with high accuracy.

また、実施形態によれば、芯体露出部１２ａの裏側（図６の下側）に正極活物質層１５が配置されることにより、正極板１２の厚み方向にレーザ光が貫通することを防止しやすい。また、不具合の原因を持つ対象品の選別を迅速に行える。また、実際には例えば正極板フープから切り出して、正極板１２を複数得ることになり、その際、どの位置から切り出したかを表す位置情報の追跡も、識別表示部３５から電極板単位で可能となる（負極板も同様である）。また、実施形態の正極板１２、電極体１１、及び電池１０の少なくとも１つと、製品の生産システムにおける品質管理、製造管理等を行う製造実行システム（ＭＥＳ）とを連動させて情報共有を行うことにより、生産システムの効率化を図れる。なお、識別表示部は、正極板１２の所定のロットの１群で同じものを用いることもできる。例えば、識別表示部は、ロット単位で設定されるロットＩＤとしてもよい。 Further, according to the embodiment, the positive electrode active material layer 15 is arranged on the back side (lower side of FIG. 6) of the core body exposed portion 12a to prevent the laser beam from penetrating in the thickness direction of the positive electrode plate 12. It's easy to do. In addition, it is possible to quickly select the target product having the cause of the defect. Further, in reality, for example, a plurality of positive electrode plates 12 are obtained by cutting out from the positive electrode plate hoop, and at that time, it is possible to trace the position information indicating from which position the positive electrode plate 12 is cut out from the identification display unit 35 for each electrode plate. (The same applies to the negative electrode plate). In addition, information sharing is performed by linking at least one of the positive electrode plate 12, the electrode body 11, and the battery 10 of the embodiment with a manufacturing execution system (MES) that performs quality control, manufacturing control, and the like in the product production system. As a result, the efficiency of the production system can be improved. As the identification display unit, the same one can be used in one group of a predetermined lot of the positive electrode plate 12. For example, the identification display unit may be a lot ID set for each lot.

図７は、実施形態の別例の電池において、負極板４５の巻き終わり側端部を示している図である。図８は、図７のＣ−Ｃ断面図である。 FIG. 7 is a diagram showing a winding end side end portion of the negative electrode plate 45 in another example battery of the embodiment. FIG. 8 is a cross-sectional view taken along the line CC of FIG.

本例の構成の場合、正極板の芯体露出部には、識別表示部は形成されない。一方、負極板４５の巻き終わり側端部の芯体露出部１８ｂのうち、負極リード２２ｂとは異なる位置である上端部には、製造工程の履歴を特定可能な識別表示部３５ａが形成される。具体的には、負極リード２２ｂの一端（図７の上端）は、芯体露出部１８ｂの幅方向一端（図７の上端）から幅方向他方側（図７の下側）に離れている。そして、芯体露出部１８ｂのうち、負極リード２２ｂが配置されない幅方向一端部（図７の上端部）に、識別表示部３５ａが形成される。識別表示部３５ａは、図４の構成の正極板１２に形成された識別表示部３５と同様である。この識別表示部３５ａは、図１〜図６の構成と同様に、二次元コードに限定せず、数字、文字、または数字及び文字の組み合わせで構成されてもよい。また、識別表示部は、突起、孔、または突起及び孔の組み合わせで構成されてもよい。また、識別表示部は、バーコード等の一次元コードであってもよい。本例では、負極板４５が、第１極板に相当し、正極板が第２極板に相当する。 In the case of the configuration of this example, the identification display portion is not formed on the exposed core body portion of the positive electrode plate. On the other hand, of the core body exposed portion 18b at the end of the negative electrode plate 45 on the winding end side, an identification display portion 35a capable of specifying the history of the manufacturing process is formed at the upper end portion at a position different from the negative electrode lead 22b. .. Specifically, one end (upper end of FIG. 7) of the negative electrode lead 22b is separated from one end in the width direction (upper end of FIG. 7) of the exposed core body 18b to the other side in the width direction (lower side of FIG. 7). Then, the identification display portion 35a is formed at one end portion in the width direction (upper end portion in FIG. 7) in which the negative electrode lead 22b is not arranged in the core body exposed portion 18b. The identification display unit 35a is the same as the identification display unit 35 formed on the positive electrode plate 12 having the configuration shown in FIG. The identification display unit 35a is not limited to the two-dimensional code, and may be composed of numbers, characters, or a combination of numbers and characters, as in the configuration of FIGS. 1 to 6. Further, the identification display unit may be composed of protrusions, holes, or a combination of protrusions and holes. Further, the identification display unit may be a one-dimensional code such as a bar code. In this example, the negative electrode plate 45 corresponds to the first electrode plate, and the positive electrode plate corresponds to the second electrode plate.

また、負極芯体１９において、芯体露出部１８ｂとは負極芯体１９の厚み方向の反対側の位置に、負極活物質層２１（図８）が配置される。これにより、負極芯体１９において、識別表示部３５ａとは負極芯体１９の厚み方向の反対側の位置には、負極活物質層２１が配置される。さらに、識別表示部３５ａは、負極リード２２ｂとともに、負極板４５に貼着された第２テープ４２により覆われる。 Further, in the negative electrode core body 19, the negative electrode active material layer 21 (FIG. 8) is arranged at a position opposite to the exposed core body portion 18b in the thickness direction of the negative electrode core body 19. As a result, in the negative electrode core body 19, the negative electrode active material layer 21 is arranged at a position opposite to the identification display portion 35a in the thickness direction of the negative electrode core body 19. Further, the identification display unit 35a is covered with the second tape 42 attached to the negative electrode plate 45 together with the negative electrode lead 22b.

上記の負極板４５の場合も、図１〜図６の正極板１２の場合と同様に、負極板４５において識別表示が形成される部分の剛性を高くできるので、識別表示を高精度に形成しやすい。これにより、不具合発生時に識別表示を確認しやすくなるので、識別表示から原因解析を迅速に行える。本例において、その他の構成及び作用は、図１〜図６の構成と同様である。 In the case of the negative electrode plate 45 as well, as in the case of the positive electrode plate 12 of FIGS. 1 to 6, the rigidity of the portion of the negative electrode plate 45 on which the identification display is formed can be increased, so that the identification display can be formed with high accuracy. Cheap. This makes it easier to check the identification display when a problem occurs, so that the cause can be quickly analyzed from the identification display. In this example, other configurations and operations are the same as those of FIGS. 1 to 6.

なお、図７〜図８の構成において、負極板４５の巻き終わり側端部ではなく、巻き始め側端部の芯体露出部に識別表示部が形成されてもよい。また、実施形態の別例として、電極体及び電池は、正極板と負極板との両方の芯体露出部に識別表示部が形成された構成としてもよい。このときには、正極板及び負極板のそれぞれで独自の製造履歴を識別表示部により特定可能としてもよい。 In the configurations of FIGS. 7 to 8, the identification display portion may be formed not on the winding end side end portion of the negative electrode plate 45 but on the core body exposed portion on the winding start side end portion. Further, as another example of the embodiment, the electrode body and the battery may have a configuration in which an identification display portion is formed on both the core body exposed portions of the positive electrode plate and the negative electrode plate. At this time, each of the positive electrode plate and the negative electrode plate may be able to identify its own manufacturing history by the identification display unit.

なお、参考例として、図２、図４、図５に示した正極板１２において、正極リード１７と識別表示部３５が配置される芯体露出部１２ａとは、正極芯体１３の厚み方向の反対側の位置に、活物質層が配置されない構成としてもよい。例えば、正極板１２の正極リード１７とは反対側面である第２面１３ｂにおいて、芯体露出部１２ａの幅方向（図５の左右方向）範囲と同じ幅方向範囲（図５の矢印δで示す範囲）に、芯体露出部が形成されてもよい。この場合、図１〜図６の構成よりも、正極板において識別表示が形成される部分の剛性が低くなるが、正極板が巻回された電極体の状態で、識別表示部が配置された芯体露出部が電極体の内部の径方向中間部に配置される。これにより、電池の不具合発生時でも、識別表示部の損傷が生じにくいという効果を得られる。 As a reference example, in the positive electrode plate 12 shown in FIGS. 2, 4, and 5, the positive electrode lead 17 and the core body exposed portion 12a on which the identification display unit 35 is arranged are in the thickness direction of the positive electrode core body 13. The active material layer may not be arranged at the position on the opposite side. For example, on the second surface 13b of the positive electrode plate 12 opposite to the positive electrode lead 17, the width direction range (indicated by the arrow δ in FIG. 5) is the same as the width direction (horizontal direction in FIG. 5) of the core body exposed portion 12a. A core body exposed portion may be formed in the range). In this case, the rigidity of the portion of the positive electrode plate on which the identification display is formed is lower than that of the configurations of FIGS. 1 to 6, but the identification display portion is arranged in the state of the electrode body in which the positive electrode plate is wound. The exposed core body is arranged in the radial intermediate portion inside the electrode body. As a result, it is possible to obtain the effect that the identification display unit is less likely to be damaged even when a battery failure occurs.

１０ 電池
１１ 電極体
１２ 正極板
１２ａ 芯体露出部
１３ 正極芯体
１３ａ 第１面
１３ｂ 第２面
１４，１５ 正極活物質層
１７ 正極リード
１８ 負極板
１８ａ，１８ｂ 芯体露出部
１９ 負極芯体
２０，２１ 負極活物質層
２２ａ，２２ｂ 負極リード
２５ セパレータ
３１ 第１テープ
３２ 第２テープ
３５，３５ａ 識別表示部
３６ ローラ
３８ レーザ光
４０ 第１テープ
４２ 第２テープ
４５ 負極板
５１ 外装缶
５２ 封口体
５３，５４ 絶縁板
５６ 張り出し部
５７ フィルタ
５８ 下弁体
５９ 絶縁部材
６０ 上弁体
６１ キャップ
６２ ガスケット10 Battery 11 Electrode body 12 Positive electrode plate 12a Core body exposed part 13 Positive electrode core body 13a First surface 13b Second surface 14,15 Positive electrode active material layer 17 Positive electrode lead 18 Negative electrode plate 18a, 18b Core body exposed part 19 Negative electrode core body 20 , 21 Negative electrode active material layer 22a, 22b Negative electrode lead 25 Separator 31 First tape 32 Second tape 35, 35a Identification display 36 Roller 38 Laser light 40 First tape 42 Second tape 45 Negative electrode plate 51 Exterior can 52 Sealing body 53 , 54 Insulation plate 56 Overhanging part 57 Filter 58 Lower valve body 59 Insulation member 60 Upper valve body 61 Cap 62 Gasket

Claims (12)

帯状の芯体と、前記芯体の両面に形成された活物質層とを有し、前記芯体が露出された露出部に集電リードが接続されており、
前記露出部は、前記芯体の長手方向一部に配置され、
前記露出部のうち、前記集電リードとは異なる位置に、製造工程の履歴を特定可能な識別表示部が形成され、
前記芯体において、前記識別表示部とは前記芯体の厚み方向の反対側の位置に、前記活物質層が配置される、
電極板。It has a band-shaped core body and active material layers formed on both sides of the core body, and a current collecting lead is connected to an exposed portion where the core body is exposed.
The exposed portion is arranged in a part of the core body in the longitudinal direction.
An identification display unit capable of specifying the history of the manufacturing process is formed at a position different from the current collecting lead in the exposed portion.
In the core body, the active material layer is arranged at a position opposite to the identification display portion in the thickness direction of the core body.
Electrode plate. 少なくとも１つの第１極板と少なくとも１つの第２極板とがセパレータを介して巻回された電極体であって、
前記第１極板が、請求項１に記載の電極板である、
電極体。An electrode body in which at least one first electrode plate and at least one second electrode plate are wound via a separator.
The first electrode plate is the electrode plate according to claim 1.
Electrode body. 請求項２に記載の電極体において、
前記第１極板は、正極板であり、
前記露出部は、前記芯体の長手方向中間部において、長手方向両側の前記活物質層としての２つの正極活物質層の間に配置される、
電極体。In the electrode body according to claim 2,
The first electrode plate is a positive electrode plate and
The exposed portion is arranged between two positive electrode active material layers as the active material layers on both sides in the longitudinal direction in the longitudinal intermediate portion of the core body.
Electrode body. 請求項３に記載の電極体において、
前記識別表示部は、前記集電リードとしての正極リードとともに、前記正極板に貼着されたテープにより覆われる、
電極体。In the electrode body according to claim 3,
The identification display unit is covered with a tape attached to the positive electrode plate together with the positive electrode lead as the current collecting lead.
Electrode body. 請求項２に記載の電極体において、
前記第１極板は、負極板であり、
前記露出部は、前記芯体の長手方向一端から長手方向の所定幅にわたる部分に配置される、
電極体。In the electrode body according to claim 2,
The first electrode plate is a negative electrode plate and
The exposed portion is arranged in a portion extending from one end in the longitudinal direction of the core body to a predetermined width in the longitudinal direction.
Electrode body. 請求項５に記載の電極体において、
前記識別表示部は、前記集電リードとしての負極リードとともに、前記負極板に貼着されたテープにより覆われる、
電極体。In the electrode body according to claim 5,
The identification display unit is covered with a tape attached to the negative electrode plate together with the negative electrode lead as the current collecting lead.
Electrode body. 請求項２から請求項６のいずれか１項に記載の電極体において、
前記識別表示部は、数字、文字、または数字及び文字の組み合わせで構成される、
電極体。In the electrode body according to any one of claims 2 to 6,
The identification display unit is composed of numbers, letters, or combinations of numbers and letters.
Electrode body. 請求項２から請求項６のいずれか１項に記載の電極体において、
前記識別表示部は、突起、孔、または突起及び孔の組み合わせで構成される、
電極体。In the electrode body according to any one of claims 2 to 6,
The identification display unit is composed of protrusions, holes, or a combination of protrusions and holes.
Electrode body. 請求項２から請求項６のいずれか１項に記載の電極体において、
前記識別表示部は、一次元コード、または二次元コードである、
電極体。In the electrode body according to any one of claims 2 to 6,
The identification display unit is a one-dimensional code or a two-dimensional code.
Electrode body. 請求項２から請求項９のいずれか１項に記載の電極体において、
前記識別表示部は、レーザマーキングで形成される、
電極体。In the electrode body according to any one of claims 2 to 9.
The identification display unit is formed by laser marking.
Electrode body. 請求項２から請求項９のいずれか１項に記載の電極体において、
前記識別表示部は、インクジェット印刷で形成される、
電極体。In the electrode body according to any one of claims 2 to 9.
The identification display unit is formed by inkjet printing.
Electrode body. 請求項２から請求項１１のいずれか１項に記載の電極体と、
前記電極体を収容する有底筒状の外装缶とを備える、
電池。The electrode body according to any one of claims 2 to 11.
A bottomed tubular outer can for accommodating the electrode body is provided.
battery.
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